<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>https://codepen.io/prvnbist/pen/gKParr</title>
    <style>
        /* <- Demo Stuff Start */

        body{
            font-family: 'Montserrat', sans-serif;
            margin:0;
        }

        .container {
            display: flex;
            justify-content: center;
            align-items: center;
            align-content: center;
            flex-wrap: wrap;
            width: 80vw;
            margin: 0 auto;
            min-height: 100vh;
        }
        .btn {
            flex: 1 1 auto;
            margin: 10px;
            padding: 30px;
            text-align: center;
            text-transform: uppercase;
            transition: 0.5s;
            background-size: 200% auto;
            color: white;
            /* text-shadow: 0px 0px 10px rgba(0,0,0,0.2);*/
            box-shadow: 0 0 20px #eee;
            border-radius: 10px;
        }

        /* Demo Stuff End -> */

        /* <- Magic Stuff Start */

        .btn:hover {
            background-position: right center; /* change the direction of the change here */
        }

        .btn-1 {
            background-image: linear-gradient(to right, #f6d365 0%, #fda085 51%, #f6d365 100%);
        }

        .btn-2 {
            background-image: linear-gradient(to right, #fbc2eb 0%, #a6c1ee 51%, #fbc2eb 100%);
        }

        .btn-3 {
            background-image: linear-gradient(to right, #84fab0 0%, #8fd3f4 51%, #84fab0 100%);
        }

        .btn-4 {
            background-image: linear-gradient(to right, #a1c4fd 0%, #c2e9fb 51%, #a1c4fd 100%);
        }

        .btn-5 {
            background-image: linear-gradient(to right, #ffecd2 0%, #fcb69f 51%, #ffecd2 100%);
        }

        /* Magic Stuff End -> */
    </style>
</head>
<body type="pug">
<div class="container">
    <a class="btn btn-1">Hover me</a>
    <a class="btn btn-2">Hover me</a>
    <a class="btn btn-3">Hover me</a>
    <a class="btn btn-4">Hover me</a>
    <a class="btn btn-5">Hover me</a>
</div>

<script>

</script>
</body>
</html>